Disease check: Reuse corprus check from spells.hpp.

apps/openmw/mwmechanics/disease.hpp

@@ -33,18 +33,8 @@ namespace MWMechanics
             if (actor.getClass().getCreatureStats(actor).getSpells().hasSpell(spell->mId))
                 continue;
 
-            bool hasCorprusEffect = false;
-            for (std::vector<ESM::ENAMstruct>::const_iterator effectIt = spell->mEffects.mList.begin(); effectIt != spell->mEffects.mList.end(); ++effectIt)
-            {
-                if (effectIt->mEffectID == ESM::MagicEffect::Corprus)
-                {
-                    hasCorprusEffect = true;
-                    break;
-                }
-            }
-
             float resist = 0.f;
-            if (hasCorprusEffect)
+            if (spells.hasCorprusEffect(spell))
                 resist = 1.f - 0.01 * (actor.getClass().getCreatureStats(actor).getMagicEffects().get(ESM::MagicEffect::ResistCorprusDisease).getMagnitude()
                                         - actor.getClass().getCreatureStats(actor).getMagicEffects().get(ESM::MagicEffect::WeaknessToCorprusDisease).getMagnitude());
             else if (spell->mData.mType == ESM::Spell::ST_Disease)